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  • What protocol (MBIM, QMI, serial, ...) is used for USB tethering in A15?

Hi, if one uses gos A15 as LTE modem via USB tethering, what protocol is in use? if multiple are supported ("standard" MBIM, Qualcomm QMI, ...), is there any that is preferred?
It may be invalid question, so pls give me a hint. Thank you!